單項(xiàng)選擇題Which of the following should be recorded in Oil Record Book Part I (machinery space operation) ?()

A.Non automatic discharge overboard of machinery space bilge water
B.Automatic discharge overboard of machinery space bilge water
C.A and B
D.Neither A nor B


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1.單項(xiàng)選擇題A ruptured diaphragm in a thermostatic expansion valve will cause the valve to ().

A.open
B.close
C.remain in its position
D.flood the evaporator with refrigerant

2.單項(xiàng)選擇題Black smoke coming from a boiler can be caused by ().

A.low water level
B.low oil pressure
C.excessively high fuel pressure
D.an improper air/fuel ratio

3.單項(xiàng)選擇題Which will cause the high pressure cutout to stop the compressor in a R-22 system?()

A.Condenser leakage
B.A shortage of liquid refrigerant
C.Excessive frost on the evaporator
D.Not enough condenser cooling water

4.單項(xiàng)選擇題Insufficient refrigerant in a refrigeration plant may result in ().

A.high discharge pressure
B.frosting of the crankcase
C.high temperature of the overboard water
D.low suction pressure of compressor

5.單項(xiàng)選擇題Air that may enter a refrigeration plant tends to collect in the ().

A.upper part of the receiver
B.upper part of the condenser
C.down stream end of the cooling coil
D.outlet end of the condenser